Table 1: Properties of p-chlorophenyl maleanilic acid ligand (L) and its new complexes of molar ratio (1:1) of transition metal cation (M = Cr, Mo or W metal carbonyls).
| Compound | Mol. formula | Mol. wt | Color | M.P °C | %C calc. (found) | %H calc. (found) | %N calc. (found) |
| L(p-ClMA) | C10H7O3NCl | 224.62 | Yellowish white | 200–203 | 53.47 (52.35) | 3.14 (3.71) | 6.2 (6.47) |
| Cr(CO)4-L complex | C17H14O8N2ClCr | 461.76 | Oily green | 179–182 | 44.21 (43.92) | 3.03 (3.7) | 6.06 (6.8) |
| Mo(CO)4-L complex | C17H14O8N2ClMo | 505.7 | Yellow | 157–160 | 40.37 (39.88) | 2.77 (3.04) | 5.54 (6.1) |
| W(CO)4-L complex | C17H14O8N2ClW | 594.63 | Yellow | 152–154 | 34.34 (35.33) | 2.35 (2.71) | 4.71 (5.4) |